Research is underway on the Mersey Estuary in the UK, mapping tidal flows. The data will be used by the designers of the new Mersey Gateway Bridge, currently being designed. This profiling work is being carried out close to Runcorn and Widnes and is mapping the strength and direction of currents in the Mersey Estuary. Part of the development of the Mersey Gateway Project, the surveying work has been carried out by specialist contractor ABPmer using Acoustic Doppler Profiling equipment. The work measured the